If internal employees access the Internet through the firewall and find that they cannot connect to the Internet normally, what command can be used on the firewall to check the interface state security zone, security policy and routing table troubleshooting? (Write out any one of the viewing commands, requiring: the words on the command line must be complete and correct to score, and cannot be omitted or abbreviated)[fill in the blank]*

The administrator is connected to the firewall through the G1/0/0 interface (the interface has been added to the Trust Zone). If the administrator is allowed to perform configuration management through the G1/0/0 login image firewall, how to configure the security policy to release flow direction? ( )[Multiple choice]*

Which of the following DDoS attack types is an attack?

Regarding IPSec SA, which of the following statements is correct?

Which of the following descriptions about the function of the iptables table is wrong?